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Team:TU Munich/Project
From 2011.igem.org
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Contents |
Overall Project
General Project Outline
This year, we aim to develop a LASER-controlled 3D-printer by innovative utilization of optogenetics. As a first step, we want to develop a genetic logical AND-gate sensitive to light of two different wavelengths (e.g. blue and red light). These bacteria are then immobilized in a transparent gel matrix, where they can be precisely actuated when hit by both blue and red light at the same time. If both of these inputs are positive, gene expression is induced. Various different gene products can be expressed using this system. For example, a simple colored pigment will allow us to create colored three dimensional objects, while expressing collagen and hydroxylapatite with consecutive biomineralization could be used to create bone tissue.
Optogenetical AND-Gate
In order to stimulate our immobilized cells in a defined spatiotemporal manner, we require two light signals which will be irradiated into the gel block from two different directions. To process these signals we will introduce an optogenetical AND-Gate into the bacteria. This logical gate is based on amber stop-codon suppression via the non-canonical tRNA supD. A light sensitive promotor induces the expression of a mRNA coding for a modified T7-polymerase containing amber stop-codons. Consequently, this T7-polymerase can only be translated by ribosomes if the correct amber tRNA (supD) is present. This amber tRNA is expressed by a second light-sensitive Promotor. Thus, only cells which receive both signals produce the desired substances.
Light Sensory Domains
We have three candidates which can be used as light sensitive promotors: the promotor of YcgF/E as blue light sensor, Cph8 as red light sensor, and ccaR/ccaS as green-light sensor. At this point, we are inclined to use a combination of the red and blue light sensor systems, because of the larger difference between the absorbtion maxima of the light sensory domains. We expect that this assembly will be the one with the lowest amount of unspecific gene expression which could occur due to overlapping of the absorption spectrums of the sensory domains.
Progress
Construct design has been completed while cloning is still in progress. Further more, we found a suitable solid matrix which is, on the one hand, clear enough to be penetrated by light beams without refracting them and, on the other hand, solidifies at a temperature that is low enough to allow for cell immobilization without harming the bacteria.
